Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bf490161b31e26…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 18:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffd1f07aec5b6e19bb34092058edda4d SHA-1: 0725ddaf75639b908d6a92369fd3da980011d313 SHA-256: 64bf490161b31e26adde55a6b1f0c9c68173f46d16a8939aa706fe6fb43fa6d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=singer+sewing+machine+model+8280+manual PDF link annotation
    • https://study4student.com/cache/fck_files/file/19650246070.pdfIn PDF document text
    • http://topas.lt/userfiles/file/91218438235.pdfIn PDF document text
    • http://com123.vn/uploads/file/zokudemolos.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/sgbv43bueneu51ruv5bjbhbdq5/fomof.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zisuxuj.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074a06ca1c6a---98534210348.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/91532655482.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/megasomile.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/bunibokekag.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/gebiluzoruvefokifam.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/43353314027.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/kutif.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fapibuxedova.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/midojixux.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc1da81bd---27601071853.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/32943656287.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108190516575039.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/dazimizazaz.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/59983115989.pdfIn PDF document text
    • https://businesslife.com/content/file/69115124325.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610f97d9be---kujegesusesomivexuvam.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/zaxapuz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d993ad9ad7---50617820758.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d592ca37c---lewodanisomav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 17472 bytes
SHA-256: 2b7f64d53e512226ce9a38baab4dbb0c1059f16282f5323bacc1399b1dee5575
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11428 bytes
SHA-256: 3ebd8355c20dda0d51d1e5091d282e41a48df8b037d5367564b11054a897cd16
font_02_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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